Some years ago I saw in Yogya a very big and long size elephant white ivory tooth. The owner told me it was from African elephant. There was together also a little yellow/brown ivory elephant tooth. I asked why a different colur: the owner told me it was from Sumatran elephant because these animals have yellow teeth.
I know that there are also different way to colur white ivory: one is to put ivory in strong tea water ..... there is also another way (in Africa was rather usual)... is to put ivory in organic yellow liquid
for some days